Split PST file using PST Splitter tool and if you’re in a confusion of what solution should take then you can take a help of Split PST file tutorial. Split Technique is useful because it allows user to Split large size Outlook PST file in some small PST files. Using Split technique you can divide large size PST file in several categories which are: split by date, split by size, split by sender email id, etc. How to Split Outlook PST see more: Split Outlook PST file.

You can split PST file in both ways, manually as well as by using professional PST Split software. But before you can purchase any such paid software, you must try the manual trick first. Microsoft Outlook has few built-in features and functions which can be used to move mailbox data from one PST file to new PST files. Read the blog post shared below for detail information:

Before you can try the manual tricks shared in the above blog post, you must take backup of your PST files. If the manual tricks fail or don't work, then only you should try professional solution for splitting PST files. I hope the shared information would be helpful here.

Create a New PST file, File>>New>>More items>>Outlook data file
Save this newly created file to a directory
From Mailbox select folder to move (Inbox, sent items, Drafts)
Under Move items select Copy to Folder
Move to new PST file you created earlier
By this way, we can reduce the size of PST and move data to new PST files or else they can go for some reliable PST Splitter Tool like I have mentioned.